Math Calculators
Scientific operations, fractions, percentages, number systems, algebra, and statistics - with step-by-step working shown for every result.
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Basic & Percent
Everyday arithmetic, fractions, percentages, and probability
Scientific Calculator
Full scientific operations: trigonometry, logarithms, exponents, roots, constants (ฯ, e), and memory functions.
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Percentage Calculator
Five modes: percent of a number, what percent is X of Y, percentage change, percentage difference, and reverse percentage.
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Fraction Calculator
Add, subtract, multiply, and divide fractions. Simplify results, convert between improper fractions and mixed numbers.
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Percent Error Calculator
Calculate percent error between experimental and theoretical values. Shows absolute error and whether result is within tolerance.
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Probability Calculator
Two event probabilities (and, or, not, conditional), binomial repeated trials with at least one, and normal distribution ranges with z scores.
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Statistics Calculator
Mean, median, mode, sample or population standard deviation, variance, quartiles, IQR outliers, skewness, and a histogram for any data set.
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Z Score Calculator
Raw score to z score and percentile, left, right, and two tailed areas, critical z values from a probability, and side by side score comparison.
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Confidence Interval Calculator
Intervals for a mean (t or z), raw data, or a proportion (Wilson and Wald), with margin of error, critical values, and required sample size.
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Slope Calculator
Slope from two points with steps, line equations in three forms, points at a distance, and slope to angle, grade, and roof pitch conversion.
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Sample Size Calculator
Survey sample size for a proportion or mean with population correction and response rate, margin of error for a given n, and power for two groups.
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Mean, Median, Mode Calculator
Mean, median, mode, and range with steps, weighted averages, estimates from grouped data, and the score needed to reach a target average.
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Permutation and Combination Calculator
Exact nPr and nCr with steps, counts with repetition, arrangements of words with repeated letters, and lottery odds for any number pool.
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Number Systems
Binary, hexadecimal, and base conversions
Algebra & Exponents
Equations, powers, and roots
Geometry
Area, triangles, volume, sides, and angles
Triangle Calculator
Solve SSS, SAS, ASA, AAS, and SSA. Get all sides and angles, area, perimeter, heights, inradius, circumradius, and classification.
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Volume Calculator
Volume for sphere, cube, box, cylinder, cone, pyramid, capsule, frustum, ellipsoid, tube, and spherical cap with unit conversions.
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Area Calculator
Area and perimeter for 12 shapes, including triangles by three sides, sectors, and regular polygons, with square feet, mยฒ, acre, and hectare conversions.
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Circle Calculator
Radius, diameter, circumference, and area from any one value, plus arc length, sector, chord, segment, and circle equations with a graph.
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Pythagorean Theorem Calculator
Find the hypotenuse or a missing leg with exact radical answers, test whether three sides form a right triangle, and find the distance between two points.
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Right Triangle Calculator
Solve every side and angle from any two values, including area or perimeter, with SOH CAH TOA ratios, altitude, and a diagram to scale.
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Date & Age
Chronological age, day spans, and date math
Age Calculator
Exact age in years, months, and days. Next birthday countdown, total days lived, weekday born, and milestones.
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Date Calculator
Days between dates, add or subtract days weeks months years, and Monday to Friday business day counts.
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Time Calculator
Add or subtract durations, find elapsed time between clocks, convert units, and handle overnight spans.
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Conversion Calculator
Convert length, mass, temperature, volume, area, and speed with NIST based metric and imperial factors.
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Hours Calculator
Convert HH:MM to decimal hours, sum timesheet days, calculate shift hours with breaks, and estimate pay.
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GPA Calculator
Semester and cumulative GPA on a 4.0 scale, optional Honors and AP weighting, and target grades for upcoming credits.
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Grade Calculator
Weighted course averages, points based totals, and the final exam score needed to reach a target percent or letter.
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Science & Utilities
Radioactive decay and random numbers
How to Use These Calculators
Pick the calculator that matches your problem type. For quick arithmetic, use the Scientific Calculator. For homework involving fractions or percentages, the dedicated tools show every step - not just the final answer.
Binary and Hex calculators are useful for computer science and electronics work. The Quadratic Formula calculator handles any second-degree equation and reports whether roots are real or complex.
Many calculators show step-by-step working. Use these to check homework or understand the method - not just copy the answer.
Common Formulas
Quadratic formula: x = (-b ยฑ โ(bยฒ - 4ac)) / 2a
Law of sines: a/sin(A) = b/sin(B) = c/sin(C)
Exact age: complete years + leftover months + leftover days
Percent change: ((New - Old) / |Old|) ร 100
Half-life decay: N(t) = Nโ ร (1/2)^(t/tยฝ)
Hours (decimal): total minutes รท 60
GPA: ฮฃ(grade points ร credits) รท ฮฃ credits
Course grade (weighted): ฮฃ(score ร weight) รท ฮฃ weight
Results are for educational purposes. Verify critical calculations independently.